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With both the GM FFV I've owned 2002 Suburban and current Impala I lost/loose 18-20% with E85 vs E10. 20% cheaper is the break even cost per mile in my experience. Half price is a no brainer.
With a conversion kit I'd expect it in the 20-25% range vs E10 as it doesn't have the advantage of different timing maps that FFV have.
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